Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a25ee2ba8135e4a2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:22 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 220b23d05df8e5a647d5656c04456fcc SHA-1: 5beb3992da6801dfed4fe739152f93c55c9a2c4c SHA-256: a25ee2ba8135e4a2094efc9c49343a4758511d4d926535778a83f6c53d96192c
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a known technique for executing malicious code upon opening. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it is designed to download and execute a secondary payload. No specific URLs or hashes were extracted, but the presence of the Auto_Open macro is a strong indicator of malicious intent.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6418 bytes
SHA-256: 6bd37b164a604b4e094bca457b04dabeaa5abf06f1e0d214af45759076e8326c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  oWxp
' 0018     20 LABEL : Cell Value, String Constant - aLmAy len=0 
' 0018     26 LABEL : Cell Value, String Constant - aMEIPudezUA len=0 
' 0018     26 LABEL : Cell Value, String Constant - aOinSMeryBJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C163 
' 0018     21 LABEL : Cell Value, String Constant - glpXlb len=0 
' 0018     26 LABEL : Cell Value, String Constant - GnbsYizNwmB len=0 
' 0018     25 LABEL : Cell Value, String Constant - GQCszONaMo len=0 
' 0018     21 LABEL : Cell Value, String Constant - hUIJRZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - KEdeCcs len=0 
' 0018     21 LABEL : Cell Value, String Constant - KHGQsF len=0 
' 0018     22 LABEL : Cell Value, String Constant - LyLlJRi len=0 
' 0018     25 LABEL : Cell Value, String Constant - mnrKRfejyO len=0 
' 0018     22 LABEL : Cell Value, String Constant - munuhyR len=0 
' 0018     23 LABEL : Cell Value, String Constant - oumKiYlr len=0 
' 0018     25 LABEL : Cell Value, String Constant - OWpMaxrMCe len=0 
' 0018     20 LABEL : Cell Value, String Constant - pZdSf len=0 
' 0018     26 LABEL : Cell Value, String Constant - PZXYKQZBHDi len=0 
' 0018     23 LABEL : Cell Value, String Constant - TqEusPli len=0 
' 0018     27 LABEL : Cell Value, String Constant - UcpxFvYNwWRh len=0 
' 0018     24 LABEL : Cell Value, String Constant - ukzoDaXav len=0 
' 0018     26 LABEL : Cell Value, String Constant - VJDGWqJVTxo len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     
... (truncated)

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